How many pound injectors do I neede for an 87 corvette ?

 

I think factory might have been 22's. Hopefully somebody else will chime in and verify that.

 

Check the sticky above for FICINJECTORS. Jon will help you out with any questions about any injectors for any year. He is the Guru for injectors.

 

24lb injectors is what i would put in it.

 

Look in the sticky messages FCINJECTORS has a really good pile of information about fuel injectors. I would ask him what he would recomend based on all of your mods.

 

I wouldn't put in 24's if it came with 22's unless you're prepared to tune the computer for the 24's. That doesn't sound like a big difference, but it's enough. In open loop you'll run too rich. In closed loop it should compensate, but why should it have to compensate when it would run right if you just put the right thing in it to start with?

Now if it came with 24's stock, then by all means put in 24's.

In the past 2 weeks I have just been put in contact with a guy who bought a car that needed some tuning work. As soon as I saw the car I recognized it, I knew the guy who used to own it. I talked to a few friends and figured out that once upon a time the car had been tuned by one of my buddies and ran great with it's modifications.

Since then somebody got the bright idea to do a few more mods and rather than tune it, they compensated by adding 30lb injectors. Stock for the car was 24. The car ran so rich that fuel practically dripped out of the tailpipe. He brought it to me and I set his injector constant to reflect his 30's and the car instantly ran better under all conditions.

I'm not against upgrades by any means, but when you go changing some things you MUST tune accordingly.

 

Thanks for all the help. I know it's a stock 87 convertable, no mods, so by my thinking it should get 22# injectors. Right ?

 

definitely 22's . here's what we recommend. they are 100% alcohol compliant and come with an unconditional 3 yr warranty
http://fuelinjectorconnection.com/sh...&productId=134

 

Thanks alot everybody. There is a set 22# FICs on e bay. I'll go for them.
God I love this sight. It's saved me many $$$$$ in the last 4 1/2 years.

 

Excuse the sarcasm, but Thank You for not doing business with one of the Supporting Members of this Forum.
I will accept a ban for pointing out that you never read any threads about your subject and state that a deal on e-bay is better than what you can find here. I hope e-bay can answer your next question.

 

It's too bad you feel you have to give some smart response like that before even double checking your facts. Jon sells his injectors on ebay, as well as his own website.

http://stores.ebay.com/Fuel-Injector-Connection

Matthew

 

OK, Point taken. You are sure he is buying from Jon's site on e-bay? If I was a supporting member of this site and you asked me for advice and used my expertise to help you out I wouldn't appreciate you buying from a competitor. A few dollars on a $200 purchase is nothing when replacing parts on a 21 year old car. I still stand behind FICINJECTORS and I haven't even installed them yet.

 

They are FICs. They are from John. They are the same price as on John's site. I do alot of e-baying so thats how I prefer to buy them. Thank you very much !

 

How do you set the injector constant, or do you need a custom chip?

 

You have to be able to modify the chip. For your car that involves a chip burner and some software. PM me if you'd like me to point you in the right direction there. Trouble is that even though the cost of this sort of thing has come down a lot over the years, you still end up paying a lot in software and hardware just to make one change in your chip, it's really not worth it for a stock car.

Furthermore, technically there is more to it than changing the injector constant. In theory you can change the injector constant and it will be very close, but to truly get it right you would need to data log and do a bunch of tweaking in the VE tables to get it perfect. That requires a data logging cable and data logging software which can cost even more. Once again it really boils down to not being worth it if the car is stock and you intend to leave it that way.

 

Nathan, I've got a stock 1992. I think it has 22lb injectors also. I was told by another that I could change to 24lb with no problems, as the ECM would compensate. True or false?

 

I responded to your other thread. A lot of people believe that the 92 LT1 has 22# injectors but if you look at the ECM the injector constant is set for 23.8# A 90 Vette which we know had 22's had an injector constant of 22.1# and a 95 Z-28 which came with 24's had an injector constant of 24.91#

So what does this all mean? I take it to mean that you'd be fine with 24's. I'm running 24# injectors out of a later model LT1 in my car and I never messed with the injector constant, but my car is far from stock as well.